Signswise Black Carbon Fiber Road MTB Mountain Bicycle Seatpost Quick disassembling. Easy to install. Durable lightweight design. Can be used for a long time. Weight: About 225g The bolts is screwed into the nut's hole slowly,when you are installing the seat post If you can not make it successfully,Please loosen it and screw it agains slowly. Screwing it forcely that will damage the nuts and bolts.